Vulnerability in Linux Kernel: wq: handle VM suspension in stall detection
Summary
GSD-2021-1000853: wq: handle VM suspension in stall detection. Affects Kernel versions < ec32c8aee92a2750557c504eed3a04fe0500a725. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It is widely used in various devices and servers. The wq (workqueue) subsystem in the Linux Kernel is responsible for managing and executing work items asynchronously. Work items are tasks that need to be performed by the kernel, such as handling I/O operations or processing interrupts. The stall detection mechanism in the wq subsystem is designed to identify and handle situations where work items are not making progress, indicating a potential system stall. However, a vulnerability has been discovered in the stall detection mechanism that could be exploited by an attacker to cause a denial-of-service (DoS) condition or potentially execute arbitrary code.
Vulnerability Detail
The vulnerability in the Linux Kernel's wq subsystem arises from a failure to handle virtual machine (VM) suspension properly during stall detection. When a VM is suspended, the wq subsystem may not correctly detect the stall condition, leading to incorrect behavior and potential security risks. An attacker could exploit this vulnerability by suspending a VM while the system is under heavy workload, causing the stall detection mechanism to fail and potentially disrupt the normal operation of the system. The impact of this vulnerability could range from a DoS condition, where the system becomes unresponsive, to the execution of arbitrary code with elevated privileges. It is important to note that the actual impact and attack plausibility have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by ensuring that their systems are not under heavy workload when suspending virtual machines. Additionally, it is recommended to follow best practices for system security, such as regularly updating the Linux Kernel and implementing appropriate access controls.
Conclusion
In conclusion, a vulnerability has been discovered in the Linux Kernel's wq subsystem that could allow an attacker to cause a DoS condition or potentially execute arbitrary code. The vulnerability has been fixed in the latest version of the Linux Kernel, and users are advised to update their systems accordingly. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software.
The wq (workqueue) subsystem in the Linux Kernel is responsible for managing and executing work items asynchronously. Work items are tasks that need to be performed by the kernel, such as handling I/O operations or processing interrupts.
The stall detection mechanism in the wq subsystem is designed to identify and handle situations where work items are not making progress, indicating a potential system stall.
The impact of this vulnerability could range from a denial-of-service (DoS) condition, where the system becomes unresponsive, to the execution of arbitrary code with elevated privileges. However, the actual impact and attack plausibility have not been proven yet.
To fix this vulnerability, it is recommended to update the Linux Kernel to the latest version available. Users can download the updated kernel source code from the official Linux Kernel repository and compile it according to the provided instructions.
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